Equity - Additional Information (Details) - USD ($)				3 Months Ended
	Mar. 29, 2016	Mar. 02, 2016	Nov. 03, 2014	Mar. 31, 2016	Mar. 31, 2015	[1]	Dec. 31, 2015
Class Of Stock [Line Items]
Issuance of common units, maximum (in units)		$ 300,000,000
Units issued in connection with private placement (in units)				765,307
Net proceeds from public offerings				$ 420,400,000
Consideration for units issued in connection with private placement				$ 8,700,000	$ 0
Aggregate percentage of general partner interest			2.00%
Units issued in connection with public offering (in units)				12,908,163
Limited partners' capital account, units outstanding (in units)				97,767,376
Capital units, publicly owned (in units)				168,614,739			154,941,269
Ownership interest (in percentage)				52.80%
Distributions to noncontrolling interest				$ (12,400,000)	$ (25,100,000)
Shell Pipeline Company L P
Class Of Stock [Line Items]
Aggregate percentage of general partner interest				2.00%
General Partner
Class Of Stock [Line Items]
Units issued in connection with private placement (in units)				15,307
Consideration for units issued in connection with private placement	$ 8,200,000			$ 500,000
Aggregate percentage of general partner interest	2.00%			2.00%
Units issued in connection with public offering (in units)	258,163			258,163
Capital units, publicly owned (in units)				3,372,295			3,098,825
Common Units | General Public
Class Of Stock [Line Items]
Units issued in connection with private placement (in units)				750,000
Net proceeds from public offerings				$ 25,200,000
Gross proceed issuance of private placement offering				$ 25,500,000
Common units per share	$ 31.75			$ 34.00
Placement fees	$ 100,000			$ 300,000
Units issued in connection with public offering (in units)	12,650,000			12,650,000
Net proceeds from public offering	$ 395,200,000
Gross proceeds from public offering	401,600,000
Underwriter fees	$ 6,300,000
Limited partners' capital account, units outstanding (in units)				76,292,308			62,892,308
Capital units, publicly owned (in units)				76,292,308			62,892,308
Common Units | Shell Pipeline Company L P
Class Of Stock [Line Items]
Units issued in connection with private placement (in units)				0
Units issued in connection with public offering (in units)				0
Limited partners' capital account, units outstanding (in units)				21,475,068			21,475,068
Capital units, publicly owned (in units)				21,475,068			21,475,068
Subordinated Units | Shell Pipeline Company L P
Class Of Stock [Line Items]
Limited partners' capital account, units outstanding (in units)				67,475,068			67,475,068

[1] (1) The 2015 financial information has been retrospectively adjusted for the acquisition of the Shell Auger and Lockport Operations.